In Leipzig Bach assumed the most prominent music position in the
city, a post with dual titles and roles. As Kantor he was responsible
for the music education of the boys enrolled at the Thomasschule. As
director musices he was responsible for the musical activity of the
city, above all, for providing music in the four principal churches.
Bach began his duties on 30 May, the first Sunday after Trinity,
at the Nikolaikirche. During the next 27 years, until his death in
1750, he wrote most of his vocal works, including almost all of the
surviving, securely attributed cantatas—about 210 in number, of
which approximately 16 are secular (questions of attribution and the
existence of works in multiple versions make it difficult to establish
unequivocal totals), the Magnificat, the St. Matthew Passion, the
Christmas Oratorio, and the Mass in B Minor. The St. John Passion,
too, belongs to the Leipzig period, although at least parts of it were
evidently composed earlier.
Bach’s weekly obligations in the four churches were divided
among four ensembles comprising students from the Thomasschule,
professional town musicians, and instrumentalists from the university
as needed. While he himself directed the best choir (a group of 12 to
16 members), appearing on alternate Sundays in the Thomaskirche
and the Nikolaikirche, student prefects led the other three groups.
For the primary churches, Bach was expected not only to prepare
but also to compose the principal music (Hauptmusik) for Sunday
services. Such pieces were defined functionally—they served as
musical exegesis of the day’s scriptural theme(s)—and were not yet
called cantatas. (Not until the 19th century was the term was applied
generally to such works, notably by Philipp Spitta and the editors of
the Bach Gesellschaft, who were primarily interested in their stylistic
characteristics.) He also provided vocal music for special occasions
such as weddings, funerals, inaugurations of newly elected city of-
ficials, and—at his insistence—the orations and four yearly festivals
(Christmas, Easter, Whitsunday, and Reformation Day) at the Uni-
versity Church (St. Paul’s Church).
Since Bach did not have a large body of cantatas on which to draw,
he began composing immediately. His first two cantatas were particu-
larly ambitious: BWV 75, Die Elenden sollen essen and BWV 76, Die
Himmel erzählen die Ehre Gottes are large, 14-movement works, about
40 minutes in duration, with matching chiastic structures. Within a few
years, Bach had produced several liturgical cycles. According to his
BACH, JOHANN SEBASTIAN • 21